Fusion
By the late 1970s, the jazz-rock sound began to change. First, the name itself gave way to the more generic label "fusion." The Mahavishnu Orchestra and Return to Forever disbanded by 1977, and Weather Report's album sales declined significantly until it too dissolved in 1985. Meanwhile, bands such as Spyro Gyra (" Morning Dance," 1979), the Yellowjackets (" Matinee Idol ," 1981), the Crusaders (" Street Life ," 1979, with lead vocal by Randy Crawford), the Pat Metheny Group (" Jaco," 1978), and the Jeff Lorber Fusion (" The Samba" 1978) became very popular in the late 1970s and 1980s. However, these bands played a style of music that largely abandoned the experimental philosophy of the early jazz-rock bands, substituting a more formulaic and predictable style that emphasized more traditional harmonies, diatonic melodies, and more conventional song structures and arrangements. The experiments in timbre, texture, complex forms, nonfunctional harmonies, and extended improvisations that had marked early jazz-rock were largely absent from these groups.